It'd be prohibitively expensive to ship. Just bring a styro shipper of whatever size you want and bring it home full. Alternatively, there are inflatable bottle cushions or just wrap it w clothes in your suitcase.
Declare at US customs and ask to pay the duty. Usually the small amount isn't worth the paperwork so they wave u thru. The limit is 2 bottles of SPIRITS but wine is 'any amount for personal use'. I brought back almost 2 cases from France last year.
Lastly, you could write down the name and use wine searcher dot com to locate and have it shipped from a US- based retailer who has it in stock. For Croatian wines, you might find sparse selection however.